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Note 9 - Segment Information - Operating Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2015	Dec. 31, 2014
Biological Indicators [Member]
Revenues	$ 7,819		$ 6,964		$ 23,537	$ 19,822
Gross profit	4,869		4,194		15,157	12,029
Selling expenses	505		365		1,372	766
Gross profit after deducting selling expense and impairment of intangible asset	$ 4,364		$ 3,829		$ 13,785	$ 11,263
Reconciling items (1)		[1]		[1]
Earnings before income taxes
Instruments [Member]
Revenues	$ 8,260		$ 8,216		$ 25,819	$ 24,966
Gross profit	5,511		5,412		16,571	15,794
Selling expenses	784		919		2,975	3,093
Gross profit after deducting selling expense and impairment of intangible asset	$ 4,727		$ 4,493		$ 13,596	$ 12,701
Reconciling items (1)		[1]		[1]
Earnings before income taxes
Continuous Monitoring [Member]
Revenues	$ 2,595		$ 2,650		$ 7,412	$ 7,982
Gross profit	1,254		1,446		3,246	4,057
Selling expenses	132		488		1,098	1,318
Gross profit after deducting selling expense and impairment of intangible asset	$ 1,122		$ 958		$ 2,148	$ 2,739
Reconciling items (1)		[1]		[1]
Earnings before income taxes
Cold Chain [member]
Revenues	$ 1,239				$ 3,079
Gross profit	575				1,443
Selling expenses	96				159
Gross profit after deducting selling expense and impairment of intangible asset	$ 479				$ 1,284
Reconciling items (1)		[1]		[1]
Earnings before income taxes
Revenues	$ 19,913		$ 17,830		$ 59,847	$ 52,770
Gross profit	12,209		11,052		36,417	31,880
Selling expenses	1,517		1,772		5,604	5,177
Gross profit after deducting selling expense and impairment of intangible asset	10,692		9,280		30,813	26,703
Reconciling items (1)	(7,241)	[1]	(5,567)	[1]	(21,043)	(15,354)
Earnings before income taxes	$ 3,451		$ 3,713		$ 9,770	$ 11,349
[1] Reconciling items include general and administrative, research and development, and other expenses.

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- Definition

General and administrative, research and development, and other expenses which comprise the reconciling items of reportable segment earnings before tax to the entity's consolidated earnings before tax.

+ References

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.4-08.(h)(1)(i))
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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
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Expenses recognized in the period that are directly related to the selling and distribution of products or services.

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-Publisher FASB
-Name Accounting Standards Codification
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